JP3601564B2 - Looper thread guide device for overlock sewing machine - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides a looper that swings around a looper axis and has a hole through which a looper thread is inserted, and a thread guide groove extending so as to communicate the eye with the base end, and the base end of the looper A thread guide hole for guiding the looper thread to the eye hole at one end and a swinging thread guide member, the looper thread guide device of the overlock sewing machine, wherein the control member controls the swing of the looper. The present invention relates to a looper thread guide device of an overlock sewing machine that controls the swing of the thread guide member in response to control the thread guide hole to the eye hole side and the base end side along the thread guide groove.
[0002]
[Prior art]
The looper thread guide device (Japanese Patent Publication No. 6-44958) of the first conventional overlock sewing machine is covered with an opening / closing body, and the threading procedure for the looper is performed by removing the opening / closing body covering the machine frame. Since openings were formed on both sides of the machine frame to which the plate was fixed, the eye of the looper was exposed from one opening, and the thread guide was exposed from the other opening.
[0003]
A conventional second looper thread guide device of an overlock sewing machine (Japanese Utility Model Publication No. 6-25271) is a conventional looper device of an overlock sewing machine that oscillates in synchronization with the vertical reciprocation of a needle. A looper L having an eye O and a looper thread guide groove G communicating with the eye O is secured to a looper base D fixed to the shaft, and the looper base D has a thread guide member having a thread hook and a thread passing hole. M is rotatably mounted within a predetermined range, and at the rotation end position, the threading hole T of the thread guide member M matches the eye O of the looper and is exposed through the machine frame opening. Was.
[0004]
[Problems to be solved by the invention]
In the conventional first looper thread guide device of the overlock sewing machine, the thread insertion operation must be performed separately at the positions of the respective openings, which is a troublesome operation because the number of threading operations is large. Returning the thread guide member to the sewing position is troublesome because the operator manually performs the operation, and there is a problem in that if the user forgets to return the thread guide member, it may cause a sewing defect such as a skipped eye or thread breakage. .
[0005]
Further, in the conventional looper thread guide device of the second overlock sewing machine, when the thread guide member M returns to the sewing position, the threading hole T does not move along the thread guide groove G of the looper L. Therefore, there is a problem that the looper thread is suddenly pulled out from the supply source and loosened due to a sudden rise near the sewing position, and the extra thread is fed out or caught by another member.
[0006]
Therefore, the present inventor has disclosed a looper which swings around a looper axis and has a thread hole through which a looper thread is inserted, and a thread guide groove extending so as to communicate the eye hole with the base end, and the looper described above. A loop guide threading device for an overlock sewing machine, comprising a thread guide hole formed at one end for guiding the looper thread to the eye hole through a base end and a swinging thread guide member. Focusing on the technical idea of the present invention, which controls the swing of the thread guide member in accordance with the movement, and controls the thread guide hole to the eye hole side and the base end side along the thread guide groove. In addition, by conducting further research and development, the need for troublesome thread hooking work and the work of returning the thread guide member to the sewing position is eliminated, preventing the looper thread from being pulled out suddenly from the supply source and causing slack to occur. And other parts It has reached the present invention to achieve the object of eliminating the problem of catching on.
[0007]
[Means for Solving the Problems]
The looper thread guide device of the overlock sewing machine according to the present invention (first invention according to claim 1) includes:
A looper that swings around a looper axis and has a thread hole into which the looper thread is inserted, and a thread guide groove extending so as to communicate the eye hole with the base end; and the looper through the base end of the looper. A thread guide hole for guiding the looper thread in the eye hole at one end, and a thread guide member that swings, the looper thread guide device of the overlock sewing machine,
A control member that controls the swing of the thread guide member in accordance with the swing of the looper, and controls the thread guide hole to the eye hole side and the base end side along the thread guide groove ;
The control member is constituted by a swing lever that controls the swing of the thread guide member by swinging around a fulcrum on the looper by engagement with a plate disposed on a machine frame,
The control member includes an elastic member inserted between the swing lever and the thread guide member, and biases the thread guide member.
The yarn guide member is formed with an arc-shaped guide hole through which a fulcrum portion constituting the fulcrum of the swing member is inserted,
The swing lever engages with a pin protruding from the thread guide member, and engages to regulate a relative angular relationship between the thread guide member and the looper so that the thread guide hole is along the thread guide groove. A hole is formed .
[0008]
The looper thread guide device of the overlock sewing machine of the present invention (the second invention of claim 2)
In the first invention,
The elastic member is constituted by a spring having both ends locked between a pin protruding from the thread guide member and the fulcrum of the swing lever .
[0009]
The looper thread guide device of the overlock sewing machine according to the present invention (third invention according to claim 3) includes:
In the second invention,
The looper includes a looper table that swings around the looper axis,
The thread guide member includes a swing member that swings about the looper shaft as a fulcrum and allows vertical movement, and the guide hole is formed on a circumference around the fulcrum. Things.
[0010]
The looper thread guide device of the overlock sewing machine according to the present invention (a fourth invention according to a fourth aspect) includes:
In the third invention,
The plate disposed on the machine frame is fixed so as to protrude laterally at a position of the bed portion of the machine frame facing the swing lever, and when the swing lever swings, it is attached to one end thereof. A lever return plate configured to engage .
[0014]
Function and Effect of the Invention
The looper thread guide device of the overlock sewing machine according to the first aspect of the present invention, which swings around the looper axis and extends so as to communicate the eye hole through which the looper thread is inserted with the base end. A looper for an overlock sewing machine, comprising: a looper having a thread guide groove; and a thread guide member that forms a thread guide hole at one end for guiding the looper thread to the eye hole through the base end of the looper and swings. In the yarn guide device, the control member controls the swing of the yarn guide member in accordance with the swing of the looper, and the eye hole side and the base end side are arranged so that the yarn guide hole is along the yarn guide groove. This eliminates the need for cumbersome thread hooking work and the work of returning the thread guide member to the sewing position, prevents the looper thread from being pulled out suddenly from the supply source, and prevents slack from occurring. , Other components The effect of eliminating the problem of being caught.
[0015]
Looper thread guide device overlock sewing machine of the first invention having the above construction, the swing lever constituting the front Symbol control member, and the plate disposed in the machine frame due to the swinging of the looper By swinging around the fulcrum on the looper by the engagement, the swing of the thread guide member is controlled, and the thread guide hole is moved to the eye side and the base end side along the thread guide groove. The control eliminates the need for cumbersome thread hooking work and the work of returning the thread guide member to the sewing position, prevents the looper thread from being pulled out suddenly from the supply source, and prevents slack from occurring. This has the effect of eliminating the problem of being caught by other members.
[0016]
Looper thread guide device overlock sewing machine of the first invention having the above described construction, said elastic member interposed between the rocking lever is pre-SL control member includes a said yarn guiding member, the thread By urging the guide member, the swing of the yarn guide member is controlled, and the yarn guide hole is controlled to the eye hole side and the base end side along the yarn guide groove. Eliminates the need for the hooking operation and the operation of returning the thread guide member to the sewing position, prevents the looper thread from being pulled out suddenly from the supply source, and prevents the thread from becoming loose, causing the extra thread to be fed out or caught on another member. Is achieved.
[0017]
Looper thread guide device overlock sewing machine of the first invention having the above construction, the arcuate guide hole formed before Symbol yarn guiding member, fulcrum portion constituting the fulcrum of the swing lever is interposed As the swing lever swings along the arc-shaped guide hole, the swing of the thread guide member is controlled, and the thread guide hole is more accurately aligned with the thread guide groove. Since the control is performed along the eye hole side and the base end side so as to follow the looper thread, it is effectively prevented that the looper thread is suddenly pulled out from the supply source and the slack is generated, and the extra thread is unreeled or caught by another member. This has the effect of effectively solving the problem.
[0018]
Looper thread guide device overlock sewing machine of the first invention having the above construction, the pin projecting from the front Symbol yarn guide member, so that said yarn guide hole in the swing lever along the yarn guide groove Since the formed thread guide member engages with the engagement hole that regulates a relative angular relationship with the looper, the thread guide member swings along the engagement hole of the swing lever. Since the yarn guide hole is controlled to the eye hole side and the base end side so as to more accurately follow the yarn guide groove, it is more effective that the looper yarn is suddenly pulled out from the supply source and slack is generated. In this case, there is an effect that the problems of extra thread feeding and catching on other members are more effectively eliminated.
[0019]
A looper thread guide device for an overlock sewing machine according to a second invention having the above-mentioned configuration is the same as in the first invention, wherein both ends of the spring constituting the elastic member are provided with a pin projecting from the thread guide member and the swing lever. Since the thread guide member is rocked by the urging force of the spring, the movement of the thread guide member is smoothed, and the thread guide hole is Since it is moved to the eye hole side and the base end side along the groove, there is an effect that the trouble caused by the operator forgetting the operation in the related art can be solved.
[0020]
A looper thread guide device for an overlock sewing machine according to a third aspect of the present invention having the above-described structure, similar to the looper base constituting the looper, swings around the looper axis and allows vertical movement in the second aspect of the invention. In the yarn guide member including the swing member, the guide hole is formed on the circumference around the fulcrum, so that the swing lever swings along the arc-shaped guide hole. The looper thread is pulled out from the supply source abruptly to cause slack because the thread guide hole is controlled to the eye hole side and the base end side so as to more accurately follow the thread guide groove by moving up and down. This effectively prevents problems such as unnecessarily feeding out the thread and catching on other members.
The looper thread guide device for an overlock sewing machine according to a fourth aspect of the present invention, which is arranged in the third aspect, faces the rocking lever of a bed portion of the machine frame as the plate disposed on the machine frame. The lever return plate fixed so as to protrude in the lateral direction at the position where the thread guide hole is engaged with one end of the swing lever when the swing lever swings, thereby returning the thread guide hole to the sewing position. It works.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0022]
(Embodiment)
The looper thread guide device of the overlock sewing machine according to the present embodiment includes a looper 5 having a thread guide groove 5b extending so as to communicate with an eye 5a through which the looper thread 20 is inserted, as shown in FIGS. , A thread guide hole 110 formed at one end and a thread guide member 110 that swings in the looper thread guide device of the overlock sewing machine. A swing lever 120 for controlling the swing of the thread guide member 110 by swinging about the fulcrum of the thread guide member 110. The swing guide lever 110 is interposed between the swing lever 120 and the thread guide member 110, And a control member 121 for controlling the yarn guide hole 11c to the eye 5a side and the base end 5c side along the yarn guide groove 5b. It is intended.
[0023]
As shown in FIG. 2, the sewing machine frame 1 has an arm 2 disposed at the upper left end, and two needles disposed below the arm 2 via a needle bar 3 so as to be vertically movable. 4, a looper 5 provided in the lower part, and an operation pulley 6 disposed on the right side.
[0024]
As shown in FIG. 2, a looper base 8 is fixed to a looper shaft 7 which is connected to a main shaft (not shown) of the sewing machine and is swingably disposed inside the machine frame 1. A bed 18 is provided at the lower left end of the sewing machine frame 1, and a front cover 19 is provided at the front right side of the bed 18 so as to be openable and closable.
[0025]
As shown in FIGS. 1, 3, and 4, an eye 5a through which a looper thread is inserted is connected to an upper end of the looper base 8 by a support screw 9 and a washer 10, and the eye 5a and the base end 5c communicate with each other. A looper 5 having a thread guide groove 5b extending therethrough is fixed.
[0026]
The thread guide member 110 is formed of a thread guide plate 11 which has a long hole 11d into which the looper shaft 7 is inserted at one end, allows vertical movement, and swings around the looper shaft 7 as a fulcrum. A thread guide hole 11c for guiding the looper thread is formed at one end of the looper 5 through the base end 5c of the eye 5a, and a hook 11b for locking the looper thread is formed at a bent portion. A guide hole 11a is formed on a circumference centered on the fulcrum.
[0027]
The swing lever 120 includes a thread guide moving lever 12 that swings around a support screw 9 screwed onto the looper 5. That is, the support screw 9 is inserted into the arc-shaped guide hole 11 a of the thread guide plate 11, and is swingably inserted into a substantially central circular hole of the thread guide moving lever 12. 9a constitutes the fulcrum.
[0028]
The torsion spring 13 as the elastic member 130 is formed of a C-shaped coil spring. One end of the torsion spring 13 is locked to the upper shaft portion 9 b of the support screw 9, and the torsion spring 13 projects from the bending portion of the thread guide plate 11. The other end is locked to the pin 14 that has been set.
[0029]
A lever return plate 15 is fixed to a bed portion 18 of the sewing machine frame 1 with a screw 16 so as to protrude rightward in the lateral direction at a position facing the thread guide moving lever 12. When it swings counterclockwise, it is configured to engage with its lower part 12b.
[0030]
As shown in FIG. 1, the thread guide moving lever 12 is engaged with the pin 14 protruding from the thread guide plate 11 so that the thread guide hole 11c is aligned with the thread guide groove 5b. An engagement hole 12a for regulating a relative angle relationship between the thread guide plate 11 and the looper 5 is formed.
The E-ring 17 fitted into the looper shaft 7 constitutes a thrust stop for the long hole 11d that allows the thread guide plate 11 to move up and down.
[0032]
In the looper thread guide device of the overlock sewing machine according to the present embodiment having the above-described configuration, in order to dispose the looper thread on the looper 5, the front cover 19 is first opened and the operation pulley 6 is operated. Then, the looper base 8 is swung clockwise (to the right in the figure) to move the eye 5a of the looper 5 and the thread guide moving lever 12 out of the bed 18.
[0033]
Next, as shown in FIG. 5, when the thread guide moving lever 12 is swung clockwise (direction B), the thread guide moving lever 12 is moved through the pin 14 which engages with the engaging hole 12a of the thread guide moving lever 12. The thread guide plate 11 swings in the direction of the eye 5a of the looper 12.
[0034]
At this time, the circular guide hole 11a of the thread guide plate 11 and the long hole 11d of the lower end allow the round hole-like thread guide hole 11c to be moved from the base end 5c of the looper 5 to the yarn guide groove 5b. Along with the eye 5a.
[0035]
Further, since the urging direction of the torsion spring 13 changes in the direction of the eye 5a with the swing of the thread guide plate 11, the thread guide plate 11 changes in the direction of the eye 5a. Is pressed and held by the eye 5a.
[0036]
By this operation, as shown in FIG. 6, the threading of the looper thread 20 to the rounded thread guide hole 11c of the thread guide plate 11 and the eye 5a of the looper 5 is performed simultaneously.
[0037]
Next, the operation of the operation pulley 6 causes the looper table 8 to swing counterclockwise (leftward in the figure) until the operation of the torsion spring 13 exceeds the dead center as shown in FIG. The lower portion 12b of the thread guide moving lever 12 is pushed by a lever return plate 15 projecting laterally on the machine frame 1, and the thread guide moving lever 12 swings counterclockwise (direction C in the figure), As described above, the thread guide hole 11c returns to the position of the base end portion 5c of the looper 5, which is the sewing position, along the thread guide groove 5b of the looper 5.
[0038]
Even if the operator forgets the return operation and rotates the sewing machine, the sewing machine itself performs the above-described return operation. That is, when the sewing machine is rotated, the looper base 8 swings counterclockwise (leftward in the drawing) by the rotational drive of the sewing machine spindle until the dead center of the operation of the torsion spring 13 shown in FIG. 7 is exceeded. Thereafter, the urging force of the torsion spring 13 is also applied to swing to the position shown in FIG.
[0039]
The looper thread guide device of the overlock sewing machine according to the present embodiment, which has the above-described operation, swings the looper base 8 clockwise (rightward in the figure), and then moves the thread guide moving lever as shown in FIG. When the thread guide plate 11 swings clockwise (B direction), the thread guide plate 11 swings via the pin 14, and the arc-shaped guide hole 11a of the thread guide plate 11 and the elongated hole 11d at the lower end thereof. Has the effect that the round hole-shaped thread guide hole 11c moves from the base end 5c of the looper 5 to a position facing the eye hole 5a along the thread guide groove 5b.
[0040]
In the looper thread guide device of the present embodiment, the urging direction of the torsion spring 13 changes in the direction of the eye 5a with the swing of the thread guide plate 11, so that the thread guide plate 11 is 6, the threading of the looper thread 20 into the round thread-shaped thread guide hole 11c of the thread guide plate 11 and the eye 5a of the looper 5 is simultaneously performed as shown in FIG. It has the effect that it can be performed.
[0041]
Further, the looper thread guide device according to the present embodiment, when the looper base 8 is swung counterclockwise (leftward in the figure) until the looper stand 8 exceeds the dead center of action of the torsion spring 13 shown in FIG. The lower portion 12b of the thread guide moving lever 12 is pushed by a lever return plate 15 projecting laterally from the frame 1, and the thread guide moving lever 12 swings in a counterclockwise direction (C direction in the figure). Similarly to the above, the yarn guide hole 11c has an effect of returning to the position of the base end portion 5c of the looper 5, which is the sewing position, along the yarn guide groove 5b of the looper 5.
[0042]
In addition, even if the operator forgets the returning operation, if the sewing machine is rotated, the looper thread guide device 8 of the present embodiment will not move until the operation exceeds the dead center of the torsion spring 13 shown in FIG. Swings counterclockwise (leftward in the figure), and thereafter swings to the position shown in FIG. 8 by the urging force of the torsion spring 13, so that the sewing machine itself can perform the above-described return operation. This has the effect.
[0043]
Further, the looper thread guide device of the present embodiment is configured to swing the thread guide plate 11 regulated by the arc-shaped guide hole 11a of the thread guide plate 11 and the engaging hole 12a of the thread guide moving lever 12. Since the guide hole 11c is moved along the yarn guide groove 5b by the vertical movement of the yarn guide plate 11 by the elongated hole 11d at the lower end of the yarn guide plate 11, slack due to extra feeding of the looper yarn is prevented. This has the effect of preventing the thread from being caught on other members.
[0044]
The above-described embodiment has been described by way of example, and the present invention is not limited to the embodiment. It will be recognized by those skilled in the art from the claims, the detailed description of the invention, and the drawings. Modifications and additions can be made without departing from the technical idea of the present invention.
[Brief description of the drawings]
FIG. 1 is a partial front view showing a looper thread guide device of an overlock sewing machine according to an embodiment of the present invention.
FIG. 2 is a front view showing the entire overlock sewing machine to which the embodiment is applied.
FIG. 3 is a left side view showing the looper thread guide device of the overlock sewing machine according to the embodiment.
FIG. 4 is a cross-sectional view of a part of the looper thread guide device of the overlock sewing machine according to the embodiment, taken along line AA in FIG.
FIG. 5 is a partial front view showing a state in which the yarn guide member has moved from the base end of the looper to the eye hole in the present embodiment.
FIG. 6 is a partial front view showing a state where a thread is passed through an eye of a looper in the embodiment.
FIG. 7 is a partial front view showing an operation dead center state of the elastic member in the middle of the movement of the thread guide member from the eye hole of the looper to the base end in the embodiment.
FIG. 8 is a partial front view showing a state in which the yarn guide member has moved to the base end of the looper in the embodiment.
FIG. 9 is a partial front view showing a state in which the thread guide member of the second conventional looper thread guide device of the overlock sewing machine has moved to the base end of the looper.
[Explanation of symbols]
1 Machine Frame 5 Looper 20 Looper Thread 5a Eye Hole 5b Thread Guide Groove 11c Thread Guide Hole 110 Thread Guide Member 15 Plate 120 Swing Lever 130 Elastic Member 121 Control Member

Claims (4)

A looper that swings around a looper axis and has a thread hole into which the looper thread is inserted, and a thread guide groove extending so as to communicate the eye hole with the base end; and the looper through the base end of the looper. A thread guide hole for guiding the looper thread in the eye hole at one end, and a thread guide member that swings, the looper thread guide device of the overlock sewing machine,
A control member that controls the swing of the thread guide member in accordance with the swing of the looper, and controls the thread guide hole to the eye hole side and the base end side along the thread guide groove ;
The control member is constituted by a swing lever that controls the swing of the thread guide member by swinging around a fulcrum on the looper by engagement with a plate disposed on a machine frame,
The control member includes an elastic member inserted between the swing lever and the thread guide member, and biases the thread guide member.
The yarn guide member is formed with an arc-shaped guide hole through which a fulcrum portion constituting the fulcrum of the swing member is inserted,
The swing lever engages with a pin protruding from the thread guide member, and engages to regulate a relative angular relationship between the thread guide member and the looper so that the thread guide hole is along the thread guide groove. A looper thread guide device for an overlock sewing machine, wherein a hole is formed . In claim 1 ,
A looper thread for an overlock sewing machine, wherein the elastic member is constituted by a spring having both ends locked between a pin protruding from the thread guide member and the fulcrum of the swing lever. Guide device. In claim 2 ,
The looper includes a looper table that swings around the looper axis,
The yarn guide member is constituted by a swing member that swings around the looper shaft as a fulcrum and allows vertical movement, and the guide hole is bored on a circumference around the fulcrum. Overlock sewing machine looper thread guide device. In claim 3,
The plate disposed on the machine frame is fixed so as to protrude laterally at a position of the bed portion of the machine frame facing the swing lever, and when the swing lever swings, it is attached to one end thereof. A looper thread guide device for an overlock sewing machine, wherein the lever return plate is configured to be engaged .

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